Camera module

ABSTRACT

A camera module includes a housing to accommodate a lens module, a stop module coupled to the lens module and configured to selectively change an amount of light incident to the lens module, and a coil portion configured to drive the stop module to selectively change an amount of light incident to the lens module. The coil portion is disposed on the housing.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/884,606 filed on Jan. 31, 2018, which claims the benefit under 35 USC119(a) of Korean Patent Application No. 10-2017-0041956 filed on Mar.31, 2017, in the Korean Intellectual Property Office, the entiredisclosures of which are incorporated herein by reference for allpurposes.

BACKGROUND 1. Field

This application relates to a camera module.

2. Description of Related Art

Recently, camera modules have become standard in portable electronicdevices such as tablet personal computers, laptop computers, and thelike, as well as in smartphones.

A general digital camera includes a mechanical stop to change an amountof incident light therein, depending on an image capturing environment,but it may be difficult for a camera module used in a small product suchas a portable electronic device to separately include a stop.

As an example, the camera module weight may be increased due to theaddition of components for driving the stop, such that an autofocusingfunction may be deteriorated.

In addition, when a circuit connection portion for driving the stop isprovided in the stop itself, tension is generated in the circuitconnection portion due to vertical movement of lenses at the time ofperforming autofocusing, such that loss of performance or a problem mayoccur in the autofocusing function.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the disclosure andtherefore it may contain information that does not form any part of theprior art nor what the prior art may suggest to a person of ordinaryskill in the art.

SUMMARY

This summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

In one general aspect a camera module includes a housing configured toaccommodate a lens module therein, a stop module coupled to the lensmodule and configured to selectively change an amount of light incidentto the lens module, and a first coil portion configured to drive thestop module to selectively change an amount of light incident to thelens module, wherein the first coil portion is disposed on the housing.

The stop module may include incident holes having different sizes fromeach other, and at least one of the incident holes being rotatablyprovided.

The stop module may include a first stop having a first incident hole;and a second stop disposed to be rotatable with respect to the firststop and having a second incident hole. A diameter of the first incidenthole and a diameter of the second incident hole may be different fromeach other.

The stop module may include a plate, a magnet portion disposed on theplate, a first stop coupled to the plate, and a second stop disposed onthe plate and configured to be rotatable with respect to the first stop.The second stop may be coupled to the magnet portion and rotated as aresult of movement of the magnet portion. The magnet portion may includea first protrusion portion extending through the first stop and thesecond stop. The first stop may include a guide hole through which thefirst protrusion portion passes, and the guide hole may be elongated ina movement direction of the magnet portion. The plate may include asecond protrusion portion, and the second stop may be rotatable aroundthe second protrusion portion. The magnet portion may include a magnetdisposed to face the first coil portion; and a magnet housing, whereinthe magnet may be coupled to the magnet housing.

The lens module may include an optical axis and be movable with the stopmodule in an optical axis direction.

The camera module may further include a focusing portion comprising amagnet disposed on a surface of the lens module and a second coilportion disposed on the housing to face the magnet.

In another general aspect, a camera module includes a housing configuredto accommodate a lens module therein; a stop module coupled to the lensmodule to be movable with the lens module in an optical axis direction;and a stop driving portion. The stop driving portion includes a magnetportion movably disposed on the stop module; and a first coil portiondisposed on the housing to face the magnet portion. The stop moduleincludes incident holes of different sizes, and at least one of theincident holes is rotatably disposed.

The camera module may further include a focusing portion including amagnet disposed on a surface of the lens module; and a second coilportion disposed on the housing to face the magnet. The stop drivingportion and the focusing portion may be positioned opposite each otherin relation to the lens module.

In another general aspect, a camera module includes a stop module. Thestop module includes a plate having a through opening to pass lighttherethrough, a magnetic portion movably disposed on the plate, a firststop having a first incident hole and coupled to the plate; and a secondstop having a second incident hole, the second stop disposed on theplate and configured to be rotatable with respect to the first stop toselectively change an amount of incident light passing therethrough,wherein the second stop is coupled to the magnetic portion.

The camera module may further include a coil portion spaced apart fromthe magnetic portion, the coil portion configured to move the magneticportion relative to the plate to selectively change the amount of lightpassing through the through opening. The plate may be movable relativeto the coil portion. The camera module may further include a printedcircuit board connected to the coil portion, wherein the plate may bemovable relative to the coil portion and the printed circuit board. Thecamera module, may further include a housing. The coil portion may bedisposed on the housing and the stop module may be configured to move inthe housing in an optical axis direction independently from the coilportion.

The second stop may be coupled to the magnet portion and rotated as aresult of movement of the magnet portion. The magnet portion include afirst protrusion portion extending through the first stop and the secondstop. The first stop may include a guide hole through which the firstprotrusion portion passes, and the guide hole maybe elongated in amovement direction of the magnet portion. The plate may include a secondprotrusion portion, and the second stop may be rotatable around thesecond protrusion portion.

Other features and aspects will be apparent from the following detaileddescription, the drawings, and the claims.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view illustrating an example of a camera module.

FIG. 2 is an exploded perspective view illustrating the camera module ofFIG. 1.

FIG. 3 is a partially exploded perspective view illustrating the cameramodule of FIG. 1.

FIG. 4 is an exploded perspective view illustrating an example lensmodule and an example stop module of the camera module of FIG. 1.

FIG. 5 is a perspective view illustrating the stop module of FIG. 4.

FIG. 6 is a side view illustrating the stop module of FIG. 4.

FIG. 7 is an exploded perspective view illustrating the stop module ofFIG. 4.

FIGS. 8A and 8B are views illustrating a form in which the stop moduleof FIG. 4 selectively changes an amount of incident light.

Throughout the drawings and the detailed description, the same referencenumerals refer to the same elements. The drawings may not be to scale,and the relative size, proportions, and depiction of elements in thedrawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader ingaining a comprehensive understanding of the methods, apparatuses,and/or systems described herein. However, various changes,modifications, and equivalents of the methods, apparatuses, and/orsystems described herein will be apparent after an understanding of thedisclosure of this application. For example, the sequences of operationsdescribed herein are merely examples, and are not limited to those setforth herein, but may be changed as will be apparent after anunderstanding of the disclosure of this application, with the exceptionof operations necessarily occurring in a certain order. Also,descriptions of features that are known in the art may be omitted forincreased clarity and conciseness.

The features described herein may be embodied in different forms, andare not to be construed as being limited to the examples describedherein. Rather, the examples described herein have been provided merelyto illustrate some of the many possible ways of implementing themethods, apparatuses, and/or systems described herein that will beapparent after an understanding of the disclosure of this application.

It will be understood that when an element or layer is referred to asbeing “on”, “connected to”, or “coupled to” another element or layer, itcan be directly on, directly connected to, or directly coupled to theother element or layer, or intervening elements or layers may bepresent. In contrast, when an element or layer is referred to as being“directly on”, “directly connected to”, or “directly coupled to” anotherelement or layer, there are no intervening elements or layers present.

An aspect of this application may provide a camera module capable ofselectively changing an amount of light incident through a stop moduleand preventing deterioration of performance of an autofocusing functioneven though the stop module is mounted in the camera module.

An aspect of this application may also provide a camera module in whicha weight of a stop module may be reduced.

An example of a camera module described in this application, may bemounted in a portable electronic device such as a mobile communicationsterminal, a smartphone, a tablet personal computer, a laptop computer,wearable glasses, or the like.

FIG. 1 is a perspective view illustrating an example of a camera module.FIG. 2 is an exploded perspective view illustrating the camera module ofFIG. 1.

Referring to FIGS. 1 and 2, the camera module 100 includes a lens module200, a focusing portion 500, a stop module 300, a stop driving portion400, an image sensor module 600, a housing 110, and a case 120.

The lens module 200 includes a lens barrel 210 including a plurality oflenses to capture an image of a subject and a carrier 220 coupled to thelens barrel 210. The plurality of lenses are disposed in the lens barrel210 along an optical axis.

The focusing portion 500 may be a device to move the lens module 200.

As an example, the focusing portion 500 may move the lens module 200 inthe optical axis direction to perform focusing.

The focusing portion 500 may include a magnet 510 and a coil portion 520to generate a driving force in the optical axis direction.

The magnet 510 may be mounted on the lens module 200. As an example, themagnet 510 is mounted on a surface of the carrier 220, as anotherexample, the magnet 510 is embedded in a wall of the carrier 220.

The coil portion 520 a, 520 b may be mounted on the housing 110. As anexample, the coil portion 520 a, 520 b includes a coil 520 a disposed toface the magnet 510 and a substrate 520 b on which the coil 520 a isdisposed, and the substrate 520 b is disposed on the housing 110.

The magnet 510 may be a moving member mounted on the carrier 220 to thusbe moved together with the carrier 220 in the optical axis direction,and the coil 520 a may be a fixed member disposed on the substrate 520b.

In this example, when power is applied to the coil 520 a, the carrier220 is moved in the optical axis direction by electromagneticinteraction between the magnet 510 and the coil 520 a.

Since the lens barrel 210 is mounted to the carrier 220, the lens barrel210 is also moved together with the carrier 220 in the optical axisdirection by movement of the carrier 220.

Rolling members 130 may be disposed between the carrier 220 and thehousing 110 to control friction between the carrier 220 and the housing110 when the carrier is moved. The rolling members 130 may have a ballform, such as ball bearings, or a cylinder form, such as rollerbearings.

The rolling members 130 may be disposed on both sides of the magnet 510.

A yoke 550 may be mounted on the substrate 520 b. As an example, theyoke 550 is disposed to face the magnet 510 with the coil 520 ainterposed therebetween.

An attractive force acts in a direction perpendicular to the opticalaxis direction between the yoke 550 and the magnet 510.

Therefore, the rolling members 130 may be maintained in a state in whichthey are in contact with the carrier 220 and the housing 110 by theattractive force between the yoke 550 and the magnet 510.

In addition, the yoke 550 may serve to focus magnetic force of themagnet 510. Therefore, generation of leakage magnetic flux may beprevented.

As an example, the yoke 550 and the magnet 510 form a magnetic circuit.

In the example, a closed loop control manner of sensing and feeding backa position of the lens module 200 may be used.

A position sensor 530 may be used to perform the closed loop control.The position sensor 530 may be a hall sensor.

The position sensor 530 may be disposed inside or outside the coil 520a, and may be mounted on the substrate 520 b on which the coil 520 a isdisposed.

In addition, the position sensor 530 may be formed integrally with acircuit element that provides a driving signal to the focusing portion500. However, the position sensor 530 and the circuit element are notlimited thereto, and may also be provided as separate components.

The lens module 200 may be accommodated in the housing 110.

As an example, the housing 110 may have a shape in which the top and thebottom are open, and the lens module 200 may be accommodated in aninternal space of the housing 110.

The image sensor module 600 may be disposed on the bottom of the housing110.

The case 120 may be coupled to the housing 110 to surround outersurfaces of the housing 110, and may serve to protect internalcomponents of the camera module.

In addition, the case 120 may serve to shield electromagnetic waves.

As an example, the case 120 shields electromagnetic waves so thatelectromagnetic waves generated by the camera module do not have aninfluence on other electronic components in the portable electronicdevice.

In addition, since several electronic components as well as the cameramodule are generally mounted in the portable electronic device, the case120 may shield electromagnetic waves so that electromagnetic wavesgenerated by these other electronic components do not have an influenceon the camera module.

The case 120 may be formed of a metal and thus be grounded to a groundpad provided on a printed circuit board, resulting in shielding theelectromagnetic waves.

The image sensor module 600 may be a device to convert light incidentthereto through the lens module 200 into an electrical signal.

As an example, the image sensor module 600 includes an image sensor 610and a printed circuit board 630 connected to the image sensor 610, andmay further include an infrared filter (not illustrated).

The infrared filter (not illustrated) may serve to remove light in aninfrared region from the light incident thereto through the lens module200.

The image sensor 610 may convert the light incident thereto through thelens module 200 into an electrical signal. As an example, the imagesensor 610 is a charge coupled device (CCD) or a complementary metaloxide semiconductor (CMOS).

The electrical signal converted by the image sensor 610 may be output asan image through a display unit of the portable electronic device.

The image sensor 610 may be fixed to the printed circuit board 630, andmay be electrically connected to the printed circuit board 630 by wirebonding.

The stop module 300 is a device configured to selectively change anamount of light incident to the lens module 200.

As an example, a plurality of incident holes having different sizes isprovided in the stop module 300, and at least one of the plurality ofincident holes is rotatably provided to change the amount of lightincident to the lens module 200. The amount of light incident to thelens module 200 may be changed by the stop module 300 depending on animage capturing environment.

FIG. 3 is a partially exploded perspective view illustrating the cameramodule of FIG. 1, and FIG. 4 is an exploded perspective viewillustrating an example lens module and an example stop module of thecamera module of FIG. 1.

As illustrated in FIGS. 3 and 4, the stop module 300 is coupled to thelens module 200, and is configured to selectively change the amount oflight incident to the lens module 200.

Since the stop module 300 allows a relatively small amount of light tobe incident to the lens module 200 in a high illumination environmentand allows a relatively large amount of light to be incident to the lensmodule 200 in a low illumination environment, the stop module canconstantly maintain image quality even in various illuminationconditions.

The stop module 300 is coupled to the lens module 200 to thus be movabletogether with the lens module 200 in the optical axis direction.

Therefore, at the time of performing autofocusing, a distance betweenthe lens module 200 and the stop module 300 is not changed.

FIG. 5 is a perspective view illustrating the stop module 300 of FIG. 4,FIG. 6 is a side view illustrating the stop module 300 of FIG. 4, andFIG. 7 is an exploded perspective view illustrating the stop module 300of FIG. 4.

In addition, FIGS. 8A and 8B are views illustrating a form in which thestop module 300 of FIG. 4 selectively changes an amount of incidentlight.

First, referring to FIGS. 5 through 7, the stop module 300 includes aplate 310, a first stop 320 coupled to the plate 310, a second stop 330disposed to be rotatable with respect to the first stop 320, and thestop driving portion 400 configured to rotate the second stop 330. Inaddition, the stop module 300 further includes a cover 340 to cover theplate 310, the first stop 320, and the second stop 330.

The first stop 320 includes a first incident hole 321 through whichlight passes, and the second stop 330 includes a second incident hole331 through which light passes.

A diameter of the first incident hole 321 and a diameter of the secondincident hole 331 are different from each other.

A case in which two incident holes having different diameters are formedin the stop module 300 is described in the present example, but thisdisclosure is not limited thereto. That is, the stop module 300 may havea plurality of incident holes having different sizes.

The stop driving portion 400 includes a magnet portion 410 disposed onthe plate 310 to be movable along one axis and a coil portion 420disposed on the housing 110 to face the magnet portion 410.

The coil portion 420 includes a coil 420 a facing the magnet portion 410and a substrate 420 b on which the coil 420 a is provided, and thesubstrate 420 b is mounted on the housing 110. The substrate 420 b maybe electrically connected to the printed circuit board 630.

A closed loop control manner of sensing and feeding back a position ofthe second stop 330 may be used. Position sensor 430 may be used toperform the closed loop control. The position sensor 430 may be a hallsensor. The position sensor 430 may be disposed inside or outside thecoil 420 a, and may be mounted on the substrate 420 b on which the coil420 a is disposed. In addition, the position sensor 430 may be formedintegrally with a circuit element that provides a driving signal to thestop driving portion 400. However, the position sensor 430 and thecircuit element are not limited thereto, and may also be provided asseparate components.

Since the coil 420 a that provides a driving force to the stop module300 is disposed outside of the stop module 300, that is, on the housing110 of the camera module 100, a weight of the stop module 300 may bereduced.

In addition, since the coil 420 a that provides the driving force to thestop module 300 is disposed on the housing 110, which is a fixed member,and is electrically connected to the printed circuit board 630, eventhough the lens module 200 and the stop module 300 are moved at the timeof performing autofocusing, the movement of the lens module 200 and thestop module 300 do not have an influence on the coil portion 420 of thestop driving portion 400.

Therefore, deterioration of an autofocusing function may be prevented.

The plate 310 is provided with a guide groove 313 in which the magnetportion 410 is disposed.

Since the guide groove 313 has a length greater than that of the magnetportion 410, the magnet portion 410 may be moved along the one axis inthe guide groove 313.

The magnet portion 410 includes a magnet 410 a disposed to face the coilportion 420 and a magnet housing 350 to which the magnet 410 a isattached.

The magnet housing 350 is provided with a first protrusion portion 351that penetrates through the first stop 320 and the second stop 330.

A guide hole 323 through which the first protrusion portion 351 passesis formed in the first stop 320, and may have a length in the movingdirection of the magnet portion 410.

Therefore, when the magnet portion 410 is moved along the one axis, thefirst protrusion portion 351 is moved in the guide groove 323, and thefirst stop 320 may be maintained in a fixed state without being affectedby the movement of the magnet portion 410.

A through-hole 333 into which the first protrusion portion 351 is fittedis formed in the second stop 330, and the first protrusion portion 351is moved in a state in which it is fitted into the through-hole 333, andthe second stop 330 may thus be moved together with the magnet portion410.

For example, the second stop 330 is rotated as a result of the movementof the magnet portion 410.

The plate 310 is provided with a second protrusion portion 311, and thesecond protrusion portion 311 penetrates through the first stop 320 andthe second stop 330.

The second protrusion portion 311 is disposed adjacent to the guide hole323, and may be positioned between a distal end and a proximate end ofthe guide hole 323.

The second stop 330 is rotatable around the second protrusion portion311. As an example, the second protrusion portion 311 serves as a shaft(rotation axis) of the second stop 330.

Therefore, when the magnet portion 410 is moved in the guide groove 313of the plate 310, the second stop 330 is rotated by the movement of themagnet portion 410.

Since the diameters of the first incident hole 321 of the first stop 320and the second incident hole 331 of the second stop 330 are differentfrom each other, amounts of incident light passing through the firstincident hole 321 and the second incident hole 331 are also differentfrom each other for a given incident light intensity.

In an example, the diameter of the first incident hole 321 is greaterthan that of the second incident hole 331, and the second stop 330 isformed to have a size sufficient to cover the first incident hole 321 ina position in which the first stop 320 and the second stop 330 overlapeach other.

Therefore, the light may be incident to the lens module 200 through thesecond incident hole 331 of the second stop 330 in the position in whichthe first stop 320 and the second stop 330 overlap each other.

In addition, the light may be incident to the lens module 200 throughthe first incident hole 331 of the first stop 320 in a state in whichthe second stop 330 is rotated.

Therefore, as illustrated in FIGS. 8A and 8B, in the example cameramodule 100, the light may be incident to the first incident hole 321 orthe second incident hole 331 depending on a desired amount of incidentlight in an image capturing environment to thus constantly maintainimage quality in various image capturing environments.

As set forth above, in the example camera module 100, the amount ofincident light may be selectively changed through the stop module, lossof performance of the autofocusing function may be prevented even thoughthe stop module is mounted in the camera module, and the weight of thestop module may be reduced.

While this disclosure includes specific examples, it will be apparentafter an understanding of the disclosure of this application thatvarious changes in form and details may be made in these exampleswithout departing from the spirit and scope of the claims and theirequivalents. The examples described herein are to be considered in adescriptive sense only, and not for purposes of limitation. Descriptionsof features or aspects in each example are to be considered as beingapplicable to similar features or aspects in other examples. Suitableresults may be achieved if the described techniques are performed in adifferent order, and/or if components in a described system,architecture, device, or circuit are combined in a different manner,and/or replaced or supplemented by other components or theirequivalents. Therefore, the scope of the disclosure is defined not bythe detailed description, but by the claims and their equivalents, andall variations within the scope of the claims and their equivalents areto be construed as being included in the disclosure.

What is claimed is:
 1. A camera module, comprising: a housing; a lensmodule accommodated in the housing; a stop module coupled to the lensmodule, and the stop module comprising one or more stop blades eachcomprising a light-incidence hole; and a stop driver configured to driveat least one of the one or more stop blades, wherein the stop drivercomprises a coil provided in the housing and a magnet disposed to beopposite to the coil.
 2. The camera module of claim 1, wherein themagnet is configured to move together with the lens module in an opticalaxis direction.
 3. The camera module of claim 1, wherein the magnet isconfigured to be moved linearly.
 4. The camera module of claim 3,wherein the magnet is configured to be moved linearly in a directionsubstantially perpendicular to an optical axis direction.
 5. The cameramodule of claim 1, wherein the stop driver is configured to rotationallydrive the at least one of the one or more stop blades.
 6. The cameramodule of claim 5, wherein the stop driver comprises a magnet housing towhich the magnet is fixed, and the at least one of the one or more stopblades is interlocked with the magnet housing.
 7. A camera module,comprising: a housing; a lens module accommodated in the housing; a stopmodule coupled to the lens module, and the stop module comprising one ormore stop blades each comprising light-incidence holes having differentsizes; and a stop driver configured to drive at least one of the stopblades, and the stop driver comprising a coil and a magnet, wherein themagnet is configured to interact with the coil to move linearly in adirection substantially perpendicular to an optical axis direction. 8.The camera module of claim 7, wherein the at least one of the stopblades is configured to rotate in conjunction with a linear movement ofthe magnet.